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2 years ago

**How do you factor -4x²+14x-6?

Mathematics

1 answer:

MAXImum [283]2 years ago

5 0

2 goes into all the terms so;

2(-2x² + 7x - 3) now you could factor it:

2(-2x - 1)(x + 3)

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A rectangle and a square have the same area. The length of the rectangle is seventy feet more than two times its width. The leng

Zanzabum

Using the side of the square find the area:

Area = 30^2 = 900 square feet.

The rectangles area is the same, 900 square feet.

Let the width = X

The length would be 2X + 70

Area = length x width

X * 2x+ 70 = 900

This expands to 2x^2 * 70x = 900

Use the quadratic formula to solve for x:

-70 +/- sqrt(70^2-4*2(-900))/2*2

X = 10

Width = x = 10 feet

Length = 2x + 70 = 90 feet

8 0

2 years ago

Please solve my question

Rina8888 [55]

Answer:

u should redder the reader about the

formulas as it is a direct question

6 0

3 years ago

Read 2 more answers

Find the complementary angle of the following <br>1)69°. 2)39°. 3)17°. 4)40°

Luden [163]

Answer:

1.)21°

2.)51°

3.)73°

4.)50°

Step-by-step explanation:

1.) 90° - 69°

= 21°

2.) 90° - 39°

= 51°

3.) 90° - 17°

= 73°

4.) 90° - 40°

= 50°

3 0

3 years ago

Elimina los signos de agrupacion y resuelve la suma de enteros 4+{+5+[-3+4+(-7+4)+4]+2

Veseljchak [2.6K]

I think that is the right!

6 0

2 years ago

A researcher reports an F-ratio with df = 2, 18 from an independent-measures research study. Based on the df values, how many tr

Romashka-Z-Leto [24]

Answer:

b. 3 treatments and 21 subjectcs

Step-by-step explanation:

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"

On this case we have 4 degrees of freedom for the numerator and 95 for the denominator.

If we assume that we have $k$ groups and on each group from $j=1,\dots,n_j$ we have $n_j$ individuals on each group we can define the following formulas of variation:

$SS_{total}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x)^2$

$SS_{between}=SS_{model}=\sum_{j=1}^p n_j (\bar x_{j}-\bar x)^2$

$SS_{within}=SS_{error}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x_j)^2$

And we have this property

$SST=SS_{between}+SS_{within}$

The degrees of freedom for the numerator on this case is given by $df_{num}=df_{within}=k-1$ where k represent the number of groups or treatments. So then if we solve for k we got $k=df_{num}+1=2+1=3$

The degrees of freedom for the denominator on this case is given by $df_{den}=df_{between}=N-k$ . And we can solve for N like this:

$N=df_{den}+k =18+3=21$ so we have 21 individuals in total

And the total degrees of freedom would be $df=N-1=21 -1 =20$

On this case the correct answer would be:

b. 3 treatments and 21 subjectcs

8 0

3 years ago